Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a4de062536bd44…

MALICIOUS

PDF

39.9 KB Created: 2020-03-14 11:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2a926fd1b32571bc188d403b6d4f012a SHA-1: 99bf19d3fb3da8137066353d7822b40a9a5427b4 SHA-256: 05a4de062536bd442861d9de4b26b7a603c7c860a65c00fa9c6ab3c8b03fe653
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which follow a pattern of numeric slugs and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the linked content. While no scripts were explicitly extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to potentially malicious websites, possibly for SEO spam or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://delgeinc.com/uploads/1/3/0/5/130589429/130589429.html#reformed+baptist+churches+in+greenville+sc
    • http://angelstouchmobileps.com/uploads/1/3/0/7/130775200/f8f72a07.pdf
    • http://knottymelody.com/uploads/1/3/0/7/130776315/lukotu.pdf
    • http://mvstuff.com/uploads/1/3/0/6/130640116/2497125.pdf
    • http://debbiegoldenberg.com/uploads/1/3/0/6/130639521/1525417.pdf
    • http://www.axismundihealingarts.ca/uploads/1/3/0/4/130489262/wulevagukila.pdf
    • http://clarkmakehits.com/uploads/1/3/0/8/130874388/veribubanaduwo.pdf
    • http://www.theindoorhockeyleague.com/uploads/1/3/0/5/130539188/keruxenikeradakiwa.pdf
    • http://live.redolivestudios.com/uploads/1/3/0/5/130551651/pipijise_xunawipipuj_tezerobepom_xopig.pdf
    • http://pinheadsquilting.info/uploads/1/3/0/6/130639126/7943154.pdf
    • http://server.bodybyblume.com/uploads/1/3/0/6/130604336/3e726f816b8fd61.pdf
    • http://themidpost.net/uploads/1/3/0/6/130639544/vojamixamepuret.pdf
    • http://ineavet.com/uploads/1/3/0/6/130604423/869612.pdf
    • http://www.ngsports.net/uploads/1/3/0/3/130379902/3953b0b.pdf
    • http://muffettakrueger.com/uploads/1/3/0/6/130620159/05664c.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007452.bin
6212c35de7e387bf409adca1f4bd3718d2ef9cf44fdd08f968271328fd30fc42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7452 7684 bytes

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